# Session Log

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## 2026-03-10

- Closed: Upload transport timeout tuning — upload route now logs explicit error categories distinguishing client abort, upstream timeout, and socket reset.
- Research: Investigated external agent standards applicable to zlh-agent. No formal standard maps cleanly — agent is purpose-built (embedded process manager + filesystem authority inside LXC, internal-only caller). Key findings: health probe split (/healthz liveness vs /readyz readiness) is a common convention but not required given single-caller architecture; graceful shutdown (SIGINT/SIGTERM, 10s timeout) is correct; structured lifecycle logging already solid; Go 1.21 slog exists if log unification is ever wanted. No open threads opened from this — no gaps requiring action.
- Grind repo updated to reflect current platform state. Misplaced architecture docs later removed — canonical docs belong in knowledge-base not zlh-grind.

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## 2026-03-14

Goal: Stabilize dev container provisioning across agent, portal, and artifact server.

Work completed:

Agent:
- catalog-driven runtime validation via devcontainer/_catalog.json (ValidateRuntimeSelection in common.go)
- EnsureDevUserEnvironment — dev user, /home/dev/workspace, correct ownership
- dotnet runtime provisioning added
- optional code-server addon provisioning added
- WriteReadyMarker after successful provision
- RuntimeInstalled() filesystem-based install guard in common.go

Portal:
- dotnet runtime added
- enable code-server option added
- Files tab enabled for dev containers

API:
- enable_code_server field added to dev provisioning payload

Blocker:
- code-server artifact on zlh-artifacts contains source repository, not compiled release
- install.sh expects bin/code-server, lib/, node_modules/ — compiled release required
- fix: replace artifact with official code-server release tarball (e.g. code-server-4.x.x-linux-amd64.tar.gz)

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## 2026-03-15

Architecture review session. Key decisions and findings:

Dev container model:
- 1 server / 1 container / 1 world confirmed as correct model
- Dev containers: full R/W access under /home/dev/workspace, no allowlist
- Multiverse/multi-world via plugins is customer-managed, not a platform concern
- Port exposure (dev-<vmid>.zerolaghub.com) identified as next major dev feature — future work
- dotnet SDK covers all C# game modding (Valheim, Core Keeper, Vintage Story, Rust/Oxide)
- Code Server confirmed as correct browser IDE approach given single public IP constraint
- Traefik dynamic file provider confirmed as correct routing approach — no plugin needed, no SRV records needed

Agent review (zlh-agent commit 6019d0bc — 2026-03-15):
- Catalog transition confirmed correct — ValidateRuntimeSelection gates all dev provisions
- Scripts unchanged — embedded script execution via bash stdin pipe, no 126 risk from runtime installs
- devcontainer/common.go is clean and complete
- node/verify.go has hardcoded /opt/zlh/runtime/node/bin/node — wrong path, pre-existing issue
- node/python/go/java install packages still use old version-unaware marker pattern — pre-existing, not a regression

Agent future work (priority order):
1. Unified structured logging (slog) — Promtail/Loki integration needs structured fields
2. Dev container /status — provisioningComplete + provisioningError fields
3. Crash recovery with backoff — 30s/60s/120s, max 3 attempts, then error state
4. Graceful shutdown verification — SIGTERM + wait before SIGKILL for Minecraft world save safety
5. Agent restart/process reattachment — detect existing process on restart

Code-server routing:
- Artifact fix confirmed working 2026-03-15
- Binary confirmed present at /opt/zlh/services/code-server/bin/code-server
- Root cause of ERR_CONNECTION_CLOSED identified: code-server is installed but never launched
- Port conflict: Node runtime is binding 6000, code-server cannot share the port
- Two fixes needed:
  1. Assign code-server a port that won't conflict with Node (6000 taken)
  2. Add launch step to addon install script — install != start, binary must be daemonized after provisioning
- Suggested launch: nohup /opt/zlh/services/code-server/bin/code-server --bind-addr 0.0.0.0:<port> --auth none /home/dev/workspace > /opt/zlh-agent/logs/code-server.log 2>&1 &